Photomultiplier nonlinear response in time-domain laser-induced luminescence spectroscopy

AUTOR(ES)

Schip, Leandro José Bossy, Buzelatto, Bruno Phelippe, Batista, Fábio Roberto, Cunha, Carlos Jorge da, Dias Jr., Lauro Camargo, Novo, João Batista Marques

FONTE

Química Nova

DATA DE PUBLICAÇÃO

2007-02

RESUMO

A new procedure to find the limiting range of the photomultiplier linear response of a low-cost, digital oscilloscope-based time-resolved laser-induced luminescence spectrometer (TRLS), is presented. A systematic investigation on the instrument response function with different signal input terminations, and the relationship between the luminescence intensity reaching the photomultiplier and the measured decay time are described. These investigations establish that setting the maximum intensity of the luminescence signal below 0.3V guarantees, for signal input terminations equal or higher than 99.7 ohm, a linear photomultiplier response.

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